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(No Model.) 2 Sheets-Sheet 1.

-M. R. GONLEY. METALLURGICAL FURNACE.

No.. 540,146. Patented May 28, 1895,

lNl/ENTOH W/TNES ES Oa/WM/ V Q (No Model.) 2 Sheets-Sheet 2.

M. R. CONLEY.

METALLURGICAL FURNACE. No. 540,146. Patented May 28, 1895" Qfgy m 0 NRT515. N [v]: L2 [1 [S D 0 LL L S U y a L5 .L1

WITNESSES/I lNVE/VTOR ITED STATES PATENT FFFIQ.

MICHAEL R. ooNLEY, or BROOKLYN, ASSIGNOR TO WILLIAM BELL, on

NEW YORK, N. Y.

METALLURGICAL FURNACE.

SPECIFICATION forming part of Letters Patent No. 540,146, dated May 28,1895. Application filed July 12, 1894. Serial No. 517,271. (No model.)

To all whom it may concern:

Be it known that 1, MICHAEL R. CONLEY, a citizen of the United States,and a resident of Brooklyn, Kings county, New York, have inventedImprovements in Metallurgical Furnaces, of which the following is aspecification.

The main object of my invention is to construct a reverberatoryopen-hearth furnace so that it will have a longer life than a similarfurnace of the Siemens type in which the flow of gas and air isperiodically reversed.

In the accompanying drawings, Figure 1 is a longitudinal section of myimproved furnace on the line 1 1, Fig. 3. Fig. 2 is an end elevation;and Fig. 3 is a sectional view on the EMS 3, Fig. 1.

I have shown my invention as applied to that type of furnace for which Iobtained Letters Patent No. 477,623, dated June 21,

1892, and for which my present improvement has been more particularlydesigned.

The furnace has the central open hearth O, and in the extended end wallsD D are provided reducing retorts E E, whose inner ends open directlyonto the melting hearth, being there preferably provided with suitablegates K. These retorts of which two at each end of the furnace are shownin this instance, are preferably inclined as described in my applicationfiled April 17, 1894, Serial No. 507,868, and extending to the outsideof the end walls are there closed by suitable doors 6. Around theseretorts are flues F in communication with the melting chamber 0 throughsuitable passages f. These fines F lead through suitable down-take fluesf, indicated by dotted lines in Fig. 1, to checkerwork B B immediatelybelow the retorts at both ends of the furnace.

I provide inlet flues G G for the air and gas in the midst of andextending through the checker-work B B, and these lines are carried tothe roof of the furnace over the melting hearth where they open outtogether as at g g. In the present instance these flues G G afterleavingthe checker-work are .shown as carried up around the ends of thefurnace to the roof, and four such dues are shown at each end, but theymay be arranged in any convenient way and in any desired number.

The air and I gas are admitted through the fiues G G at both ends of thefurnace at the same time and passing up to the roof of the meltingchamber they mix and become ignited at g 9. After acting upon the bathin the hearth the products of combustion pass off at both ends of thechamber through the fines around the reducing retorts, containing theore or other material to be there treated and thence the products ofcombustion pass down to and through passages B, B, consisting ofchecker-work where the waste heat is further utilized in heating theincoming airand gas. By arranging this checker-work with thecommunicating flues extending through it, immediately below the retorts,I am enabled to utilize the waste heat, while at its hottest, to thebest advantage, and furthermore have a compact construction of furnace.In some cases it may be preferable not to carry the gas flues throughthe checker-work, but to bring the hot gases directly from the producerto the dues in the roof of the furnace as indicated for instance bydotted lines at g g in Fig. 1.

By the construction described the furnace is subjected to a continuousuniform heat and will last longer as a structure than where thereversing principle is used.

I claim as my invention- 1. A metallurgical furnace having a meltingchamber and reducing retorts at opposite ends of the melting chamber,with air and gas flues opening into said chamber, checkerworkimmediately below said retorts, and outlet fiues leading around theretorts to the checker-work, the air inlet flues extending through saidchecker-work, substantially as described.

2. A metallurgical furnace having a melting chamber and reducing retortsat opposite ends of the melting chamber with air and gas fiues openinginto said chamber, checkerwork immediately below the retorts and outletflues leading around the retorts to the checker-work, the air and gasinlet flues extending through said checker-work, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MICHAEL R. CONLEY.

